Hi Fanny,
Transforming an audio output to an input within the MATLAB environment or through the "audiodevinfo" function isn't directly possible. This is because the designation of a device as either an input or an output device is determined by the host operating system and the device drivers, not by MATLAB itself.
Therefore, you will need to go and check in your corresponding Operating System's sound settings to make sure that the microphones are recognized and enabled as input devices.
In case, MATLAB still does not recognise your devices correctly while they are being correctly recognised by the OS, try using the "audiorecorder" function to manually force the recording device. This can be done as following:
recObj = audiorecorder(SamplingRate, BitDepth, NumChannels, DeviceID);
Replace the "DeviceID" with the ID of your required device.
Additionally, you can find the documentation link here: https://www.mathworks.com/help/matlab/ref/audiorecorder.html
Hope this helps!
